Re: [Discuss-gnuradio] The GMSK demodulation

[Tom Tsou]

On Fri, Feb 28, 2014 at 11:51 AM, Nick Foster <address@hidden> wrote:
> I'm working on a generalized CPM demod based on Achilleas's previous work in
> gr-trellis/src/examples/test_cpm.py, and I have it more or less working
> although there are plenty of little bugs to work out. Since the Viterbi part
> was more or less worked out for me, synchronization is the hard part; my
> application isn't GSM, and I'd like the solution in Gnuradio to be
> applicable to a wide range of systems -- this means closed-loop timing and
> freq synchronization instead of just doing data-aided estimates from the
> preamble.

I don't have much to add, but Nick and Sylvain touched on the largest
difference between the Gnuradio GMSK demod and GSM/TDMA type burst
processing - and it's not the Viterbi. The use of synchronization
loops (or lack thereof) in the demod is really the separating factor.

  -TT